JP3267286B2 - Electronic clock with generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power generation system in which a permanent magnet rotor is rotated by rotation of a rotary weight, an induced voltage generated in a coil is charged in a storage means, and clockwise operation is performed by an output of the storage means. The present invention relates to a specific configuration of an electronic timepiece with a device.

[0002]

2. Description of the Related Art Conventionally, in a wristwatch using a battery, it has been a major problem to extend the battery life. However, the size of batteries used in small wristwatches was naturally limited. As one means for solving these problems, as shown in US Pat. No. 4,653,931, a solar battery is provided on a display surface such as a dial, and a secondary battery or a charging capacitor is charged by the solar battery. The electronic wristwatch drives a clock circuit by the output of the secondary battery or the capacitor. However, in this configuration, since a black or blue solar cell is arranged on the dial, the design is limited, and this is not preferable as an electronic timepiece whose design is sold.

As another means, there has been an idea of providing a mechanical operating portion such as a rotary weight in a timepiece and rotating the rotor on a permanent surface based on the mechanical operating portion to generate power. However, at present the generator itself has become large and no watch has ever been realized.

[0004]

SUMMARY OF THE INVENTION The present invention realizes a thin electronic timepiece with a power generation device which does not have the drawbacks of the conventional rechargeable electronic timepiece and which has high charging efficiency.

[0005]

An electronic timepiece with a power generating device according to the present invention is an electronic timepiece with a power generating device for converting mechanical energy obtained from a rotating weight into electric energy. , A permanent magnet rotor rotated by the power transmission unit, a stator disposed around the permanent magnet rotor, a receiving member that supports the permanent magnet rotor, and a base plate, the power transmission unit Can transmit the rotation of the oscillating weight to the permanent magnet rotor side, and a oscillating weight gear provided on the oscillating weight, and can transmit the transmission pinion meshing with the oscillating weight gear and the rotation to the permanent magnet rotor side. A transmission train having a transmission gear provided with a transmission gear, wherein the transmission wheel is pivotally supported by the receiving member and the main plate, and the rotary weight gear and the transmission pinion are the rotary weight and the receiving member. The transmission gear is disposed between the receiving member and the base plate in the cross-sectional direction, and the permanent magnet rotor includes a rotor true including a pin and a rotor magnet including a permanent magnet. The rotor magnet is magnetized into two or more poles using a rare earth magnet, and a ratio of a diameter of the rotor to a thickness of the rotor is 0.05 to 0.5.

[0006] In the electronic timepiece with a power generating device according to the present invention, the stator may be an integral type or a two-piece type.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail with reference to the drawings. FIG. 1 is a front plan view of the power generation electronic wristwatch of the present invention. On the upper surface of the main plate 1, a time display wheel train, a step motor, a power storage means, a power generation device, and a circuit board are arranged. Each part will be described sequentially with reference to the drawings. 2 (a), 2 (b),
FIG. 2C is a cross-sectional view of a main part of FIG. 1 and will be described in conjunction with FIG.

The time display wheel train is driven by a step motor including a coil block 3, a plate-shaped stator 4 and a permanent magnet rotor 5, and an intermediate wheel 6 meshing with the rotor 5 sequentially.
The fourth wheel 7, the third wheel 8, the second wheel 9, the minute wheel 10, the hour wheel 1
Consists of one. The train wheel bridge 12 supports the front side train from the rotor to the third wheel 8 with the main plate 1. The coil 3 includes a coil and a magnetic core penetrating the coil, and the coil block 3
Are arranged so as not to be separated from the train wheel bridge 12 so as to prevent the train wheel portion from becoming thick.

As shown in FIG. 2, the power generating device comprises a rotary weight 15 rotatably supported via a bearing 14 on a rotary weight receiver 13 disposed above a train wheel support, Rotating gear 16 fixed integrally with the rotating weight gear 1
6 includes a transmission wheel 17 and a permanent magnet rotor 18 for power generation, which are sequentially meshed and rotated, a stator 19 for power generation, and a coil block 20 for power generation arranged around the rotor 18 for power generation. The oscillating weight 15 is formed by welding an oscillating weight body 15a and an oscillating weight 15b. The oscillating wheel stem 21 fixed to the bearing 14 has the oscillating weight 1 at the upper end.
5a is fixed by caulking, and the rotary weight gear 16 is fixed to the lower end. The bearing 14 is a well-known one, and includes an outer ring portion 14a fixed to the oscillating weight receiver 13, an inner ring portion 14b fixed to the oscillating wheel stem 21, and the ball 1 disposed therebetween.
4c. Report car 17 is a story car 17 with kana
a and a transmission gear 17b frictionally coupled thereto. The permanent magnet rotor 18 is composed of a rotor stem 18a having a pin and a permanent magnet 18b, and is formed flat to increase power generation efficiency. Experiments have shown that the charging efficiency is increased when the ratio of the rotor diameter bRd to the rotor thickness is 0.05 to 0.5, more preferably 0.1 to 0.3. The rotor magnet is made of a rare earth magnet such as Sm ₂ Co ₁₇ which is lightweight and has a high magnetic flux density, and is magnetized in two poles.
Eight poles and the like are also possible. Transmission wheel 17 and generator rotor 18
Is supported by the ground plate 1 and the rotary weight receiver 13, and the coil block 20 is arranged so as not to overlap with the rotary weight receiver 13 to prevent the clock body from becoming thick. Further, as is apparent from FIG. 1, the transmission wheel 17 and the power generation rotor 18 which are to be a power generation wheel train are dispersedly arranged so that the display wheel trains do not overlap each other.
Clock coil block 3 and power generation coil block 20
Are also distributed at different positions on the outer periphery of the base plate to prevent the base plate from becoming thick.

In such a power generator, when the rotary weight 15 rotates, the rotor 18 is rotated at an increased speed via the rotary weight gear 16 and the transmission wheel 17, so that an induced voltage is generated in the coil block. The induced voltage is charged into a capacitor serving as a power storage means via a circuit block described later. The oscillating weight is easily rotated by the natural swing of the arm when carrying, so that sufficient charging can be obtained. According to experiments,
The increase ratio of the rotary weight 15 to the rotor 18 is 30 to 20.
It was found that it was necessary to set the range to 0. In the present invention, the stator 19 is a one-piece stator.
This is to prevent a body-shaped stator (described in US Pat. No. 3984972) from increasing the pulling force between the rotor and the stator and causing a brake for the rotation of the rotating weight. Of course, if the setting is strict, a two-piece stator can be used.

In the case of the above-described power generator, if a strong impact load torque is applied to the rotary weight 15 due to a drop or the like, the gear supporting portion of the power transmission unit and the gear teeth are damaged, and the impact resistance is deteriorated. Have a problem. In order to improve impact resistance, it is necessary to increase the strength of individual parts to withstand the impact force, but this is accompanied by the enlargement of the structure, and it is difficult to adopt it for small products such as watches. There is a problem that it becomes difficult.

Therefore, in the present invention, at least one mechanism for transmitting power to the power transmission portion of the rotary weight by frictional force is provided. At this time, it is possible to prevent the mechanism that transmits power by the frictional force from slipping and to transmit a strong impact load torque to the power transmission unit subsequent to the mechanism.

Specifically, as described above, the transmission wheel 17a and the transmission gear 17b of the transmission wheel 17 are mounted with frictional force. FIG. 3 shows a plan view of the transmission gear 17b. The transmission wheel 17b is elastically attached to the transmission gear 17b by the elastic arm 17c.

The frictional force is set based on the following relationship. First, considering the normal time, the power must be transmitted without slipping, so that the frictional force is larger than the mechanical load such as the load due to the magnetic force generated in the rotor 18 and the stator 19 and the friction of the wheel train. Next, considering the time of impact,
Since the load due to the magnetic force increases due to the electromagnetic induction when the rotation speed of the rotor 18 increases, the frictional force is smaller than this load and the mechanical load.

[0015] These values satisfy the actual use if they are simply obtained according to the following concept. The lower limit of the frictional force is set in such a manner that the torque is converted by the ratio of the number of teeth to the imbalance torque of the rotating weight. For example, the unbalance torque of the rotating weight is Wgc
m, the number of teeth of the rotary weight gear is Z ₁ , and the number of teeth of the transmission wheel is Z ₂
And then transmission wheel frictional force generated when the _{can, WX (Z 2 / Z 1} ) may be set above. In this way, when the watch is carried quietly, no slippage occurs because only an acceleration of about 1 G is applied to the rotating weight. The upper limit of the frictional force may be set to a value smaller than the mechanical strength limit of a tenon, teeth, and the like of a vehicle.

According to the above configuration, the frictional force is larger than the torque of the rotary weight 15 generated by the movement of the arm or the like during normal carrying, so that the transmission gear 17b allows the rotation of the rotary weight 2 to be For example, when a strong impact such as a drop is applied to the rotary weight 15, the torque of the rotary weight 15 exceeds the frictional force, so that the transmission gear 17b slips, and the rotation of the rotary weight 15 is transmitted to the following vehicle. I can't tell.

The position for frictional engagement may be the position of another vehicle. That is, a friction engagement portion may be provided between the rotary weight gear 16 and the rotary weight wheel stem 21 and between the rotor pinion 18a and the rotor magnet 18b.

In this case, the frictional force differs depending on the ratio of the number of teeth. In the former case, it is necessary to exceed the unbalance torque of the rotary weight, and in the latter case, the number of teeth of the transmission gear and the true pinion of the rotor is required. It may be smaller by the ratio.

Further, regarding the structure for generating the frictional force,
The present invention is not limited to the above, and various structures can be considered, such as a well-known cylinder pinching method used as a slip mechanism of a branching wheel and a method using a magnetic force of a magnet.

An example of a structure provided with a magnet is shown in FIG. 5 and will be described with reference to the drawing. 17a indicates a transmission wheel made of a magnetic material, 17d indicates a magnet, and 17b indicates a transmission wheel gear. The magnet 17d is fixed to the gear 17b, and the gear 17b is
a is engaged with backlash. The gear 17b is fixed to the pinion 17a by the attractive force of the magnet 17d and the pinion 17a. When the force from the rotating weight is weaker than the suction force, the rotation is transmitted, and when the force is stronger than the suction force, the kana 17a idles. Also, if this structure is applied to power generation play, the magnet can also be used as a rotor magnet.

The storage means is constituted by the capacitor 2. As shown in FIG. 1 and FIG. 28 (c), the capacitor 2 has a lead plate 23 fixed to the convex electrode portion 2a by welding. The capacitor 2 is installed in a concave portion of the earth pole so that the lead plate 23 is turned upside down, and is pressed and held by a ring-shaped capacitor retainer 24 via an insulating plate 25. Capacitor retainer 24 is fixed to ground plate 1 by screws 26 and 27.
At this time, the pattern 28a of the circuit board 28 is sandwiched between the lead plate 23 and the ground plate 1 to establish electrical conduction of the negative electrode.
The positive electrode of the capacitor is electrically connected to the side of the capacitor 2 by making the positive lead 39, which is electrically connected to the circuit board pattern, elastically contact the side of the capacitor 2.

The circuit board 28 is based on a flexible board, and has an IC chip 30, a diode 31, a boosting capacitor 32, an auxiliary capacitor 33, and a crystal oscillator 34 fixed on a surface facing the ground plate and connected to each other by an electrode pattern. ing. One end 28b of the circuit board 28
Is provided with a pattern that is connected to the pattern of the coil lead board 20a provided on the coil block 20 for power generation. At the other end 28c of the circuit board 28, a pattern 28a as a connection portion with the above-mentioned capacitor 2 projects from the circuit board. In the middle of the circuit board 28, a hole 28d for escaping the clock coil block 3 and the quartz oscillator 34 is formed to prevent the watch from becoming thick. Around the hole 28d, a coil lead board 3a of the clock coil block 3 is provided.
A pattern to be connected to this pattern is formed and is connected by crimping with a screw 36. I fixed to the circuit board 28
C chip 30, diode 31, boost capacitor 3
2. The electronic components such as the auxiliary capacitor 33 and the crystal unit 4 are housed in the recesses of the plastic base plate 1 for protection, and are designed so that the timepiece body does not become thick. Further, the circuit boards 28 are dispersedly arranged so as not to overlap the display wheel train and the power generation wheel train to prevent the watch from becoming thick.

On the front side of the circuit board 28, a circuit holding plate 29 made of a thin metal plate is mounted. The circuit holding plate 29 includes the screws 35, 36, 26 and the coil block 3
Are fixed to be interposed between the screws of the screw 38 for fixing the circuit board and the circuit board, and are fixed to the base plate with multiple screws. A spring portion 29 that presses the circuit board 28 around the base plate so as not to disturb the locus of the rotary weight is provided on a part of the circuit pressing plate 29.
a and 29b are formed, and a spring portion 29C is formed in the vicinity of the screw 38 for pressing a mandrel (not shown) for positioning the winding stem. The circuit board facing the spring portion 29c has a hole formed therein. Further, a spring portion 29d for pressing the quartz oscillator 34 against the base plate and a spring portion 29eI for contacting the case and grounding are integrally provided. The reason why the ground lead spring portion 29e is provided on the side surface of the timepiece is to prevent the locus of the rotary weight 15 from being obstructed.

As described above, the time display wheel train, the step motor,
The storage means, the power generation device, and the circuit board have been sequentially described. Here, features of the entire layout will be described.

The layout in this embodiment is such that the display wheel trains 5, 6, 7, 8 and the power generation wheel trains 17, 18, the timepiece coil block 3, the power generation coil block 20, the capacitor 2, and the circuit board 28 are mutually planar. The electric elements on the circuit board are housed in recesses on the base plate 1 to prevent them from becoming thicker.
By arranging the space 4 in an unnecessary space outside the clock coil 3 to save space, the machine body excluding the rotary weight 15 can be made flat as a whole.
In addition, since the rotary weight 15 is configured such that the thick portion 15c on the outer circumference is provided on the outer peripheral portion of the base plate outside the coil and is coplanar with the coil in cross section, the rotary weight 15 and the rotary weight receiver 1 are formed.
3 can be minimized, and an electronic timepiece that has a rotating weight and is not inferior to the thickness of a normal timepiece as a whole can be provided. In addition, by bringing the heaviest part of the rotating weight to the outermost periphery of the timepiece, an electronic timepiece with a power generating device with high power generation efficiency can be provided.

The power generation circuit used in this embodiment is briefly shown in FIGS. 4 (a) and 4 (b). FIG. 4A shows an example using a full-wave rectifier circuit. The full-wave rectifier diodes 41, 42, 43, and 44 are connected to the power generation coil 40,
The storage capacitor 45 is connected there. An auxiliary capacitor 46 has a smaller capacity than the capacitor 45. The auxiliary capacitor 46 is charged by the electric charge of the capacitor 45, and the clock circuit 47 is thereby driven. A current as shown by a solid line flows with one rotation of the rotating weight, and a current flows as shown by a broken line with the other rotation. This allows any rotation of the rotating weight to be used for charging. Reference numeral 48 denotes a limiter which detects when the capacitor 45 is in an overcharged state, ends both ends of the coil, and prevents further charging.

FIG. 4B shows an example using a half-wave rectifier circuit. In the figure, a coil 40, a capacitor 45, an auxiliary capacitor 46, a clock circuit 47, and a limiter 48 are the same as those in FIG. In this embodiment, only one diode 49 is used as a current element. In this case, since the number of diodes is reduced, efficient charging is possible so that the resistance component is reduced accordingly.

In order to use the stored voltage of the capacitor 45 more effectively, the capacitor 45 and the auxiliary capacitor 46 are used.
It is also possible to insert a booster circuit between them. This specific configuration is described in SerialNo. 06 / 849,932.

[0029]

According to the present invention, the permanent magnet rotor comprises a rotor comprising a rotor and a permanent magnet provided with a pin, and the rotor magnet is magnetized to two or more poles using a rare earth magnet, and the diameter of the rotor is increased. And the thickness ratio of the rotor is 0.05-0.
5, the rotor becomes flat, the power generation mechanism can be made thinner, and the charging efficiency can be improved.
An electronic timepiece with a power generation device having a thin power generation mechanism, excellent design, and high charging efficiency can be realized.

[Brief description of the drawings]

FIG. 1 is a plan view of a power generation electronic wristwatch according to the present invention.

FIG. 2A is a partial cross-sectional view of the electronic wristwatch of FIG. 1;
FIG. 1B is a partial cross-sectional view of the electronic wristwatch shown in FIG.
Partial sectional view of an electronic wristwatch.

FIG. 3 is a plan view of a transmission gear.

FIG. 4 is a schematic diagram of a power generation circuit used in the power generation electronic wristwatch of the present invention.

FIG. 5 is a sectional view of an AG intermediate wheel showing another embodiment of the invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Ground plate 2 ... Capacitor 3 ... Coil block 4 ... Stator 5 ... Coil block rotor 12 ... Wheel train receiver 15 ... Rotating weight 16 ... Rotating weight gear 17 ... Transmission wheel 18 ... permanent magnet rotor for power generation 19 ... stator for power generation 20 ... coil block for power generation 28 ... circuit holding plate 29 ... circuit board 40 ... coils for power generation 41, 42, 43, 44 ... diode 45 ... … Storage capacitor 46… Auxiliary capacitor 47… Clock circuit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G04C 10/00 G04C 3/14 H02K 1/27 501

Claims (2)

(57) [Claims] 1. An electronic timepiece with a power generating device for converting mechanical energy obtained from a rotating weight into electric energy,
A power transmission unit for transmitting power from the rotary weight, a permanent magnet rotor rotated by the power transmission unit, a stator disposed around the permanent magnet rotor, and a bearing for supporting the permanent magnet rotor. A rotating weight gear provided on the rotating weight so that the rotation of the rotating weight can be transmitted to the permanent magnet rotor side; and a transmission pinion meshing with the rotating weight gear. A transmission wheel having a transmission gear capable of transmitting rotation to the permanent magnet rotor side, the transmission wheel being pivotally supported by the receiving member and the base plate, and having the rotary weight gear and the transmission pinion. Is disposed between the rotating weight and the receiving member in the cross-sectional direction, the transmission gear is disposed between the receiving member and the base plate in the cross-sectional direction, and the permanent magnet rotor is From magnet A rotor magnet, wherein the rotor magnet is magnetized to two or more poles using a rare earth magnet, and the ratio of the diameter of the rotor to the thickness of the rotor is 0.05 to 0.5. Electronic clock with power generator. 2. The electronic timepiece with a power generator according to claim 1, wherein the stator is of an integral or two-piece type.